Matching with std.concurrency receive

[Adam]

Hrm... that's a bit problematic. If I do use the exact match, it seems
to hang / lock up (probably the lack of support for classes?).
However, that's pretty much never the case of what I want to do, since
what I'm trying to do involves passing / accepting an interface and
its implementations.

I guess I can manage this with a static table of operation IDs
pointing to function delegates. Sadness. Haha

Alright, thankee!